JUSTIN BIEBER

What was supposed to be a celebration turned into the "worst birthday," the freshly minted 19-year-old Tweeted Friday. Why the sad face? After shooting down rumors he partied in a club with underage Jaden Smith, 14, he blamed his bad night on "dummies pushing over my fans." Then Monday brought actual drama: The Biebs showed up almost two hours late to his Monday concert at the O2 Arena, leaving fans fuming and resulting in a Twitter apology.

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